Often on poker sites you will be offered Freeroll,s this is a way that pokerrooms allow you to play without risk to your own money .
by doing this it gets you use to there software with a view for you to start entering other real money buyin games on there site,
MTT freerolls :
(Multi Table Tournament) for which you can sign up without having to pay to enter the game, where you will be playing against other players ,You can play for real money or prizes, in a tournament, without having to pay.
Freerolls are ideal to increase your poker skills without taking a risk.
Often a freeroll ticket is awarded to a player in exchange for player points, which are earned while spending their money in other games.
It is a great opportunity to add to your bankroll for zero risk.
Private Freerolls :
Are games set up between affiliate,s and the poker room for players that use links and banners that are displayed on poker chat forum as a thank you to players for signing up from link or banner .
most often theses games are very small numbers of players in them and will be password protected ,